Process for producing glass

Abstract

A process for producing a glass that is high in optical homogeneity degree and when remelted inhibits any substantial increase of platinum granules. There is provided a process for producing glass through melting of a glass raw material batch in a platinum vessel, molding into a preform glass, remelting of the preform glass in a platinum vessel and molding, characterized in that selection of the glass raw material batch and / or regulation of melting conditions is carried out so that the beta-OH value of the glass after remelting is 0.30 / mm or less.

Description

technical field [0001] The present invention relates to a method of manufacturing glass, in particular to a method of manufacturing glass used in optical pickup lenses for CD, MD, DVD and other optical disk systems, video recorders, and general camera lens components. . Background technique [0002] Glasses of various composition systems have been proposed as optical glasses used for optical pickup lenses of CD, MD, DVD, and other various optical disc systems, video recorders, and general camera imaging lenses. (For example, refer to Patent Documents 1 to 4) [0003] Such glass is required to satisfy predetermined optical constants (refractive index, Abbe number) and to be optically extremely high-homogeneity glass without internal defects such as bubbles, impurities, and grains. [0004] Fusion vessels made of refractory materials are widely used in glass manufacturing. However, when a container made of a refractory material is melted, the refractory material may be corr...

AI Technical Summary

Problems solved by technology

However, when a container made of refractory material is melted, the refractory material may be corroded to cause internal defects such as texture and air bubbles in the glass.

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